Practice Room · Big sums and products

Practice: Head maths

For each question, give a low and a high you are 80% sure the answer sits between. Tighter brackets score more; a miss scores zero. You can type 2 million, 3e9, 1.5k or 45%.

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Head mathsQuestion 1 of 5

What is 1 + 2 + 3 + … + 19,186 (every whole number up to 19,186 added together)?

Low High

Head mathsQuestion 2 of 5

Without a calculator: what is 983 × 7,735?

Low High

Head mathsQuestion 3 of 5

What is 1 + 2 + 3 + … + 19,425 (every whole number up to 19,425 added together)?

Low High

Head mathsQuestion 4 of 5

What is 1 + 2 + 3 + … + 25,263 (every whole number up to 25,263 added together)?

Low High

Head mathsQuestion 5 of 5

Without a calculator: what is 490 × 4,917?

Low High

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